When is the best time to sell a stock?

Investing can be an emotional roller-coaster depending on your risk preferences. Portfolio managers and financial analysts both encourage investors to be "in it for the long haul" and never rely on one company or stock class. Sometimes, even the best performing stock needs to be kicked to the curb. Why should you sell a stock if you are a long-term investor? How do emotions affect individual investors? How doyour emotionsaffect your risk preferences?Explain your opinion.